Heater/AC operating unit (N23) removal and installation procedure for Smart 451.3/4 with flexible shaft and cable routing.

Service manual page showing heater/AC unit removal steps and component identification diagram.

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See all HVAC & Comfort figures for the Fortwo (450), or browse the full figure library. Part numbers and callouts are community-sourced and cross-referenced against the manuals — confirm with your VIN before ordering.